RedPen is an open source proofreading tool to check if your technical documents meet the writing standard. RedPen supports various markup text formats (Markdown, Textile, AsciiDoc, Re:VIEW, reStructuredText and LaTeX).
Use Xilize to create XHTML pages or entire websites with just a plain-text editor. The markup is similar to Textile and extensible via BeanShell. Run as a jEdit plugin, from the command line, or embed in a Java program. Small, fast, easy-to-use.